I have a 87 T with under 1,ooo miles on it.Last week I entered it into a local indoor show. During the show,I had them propped up about six inches. Near by there was a sound sys display - they were cranking up the base - vibrated the T roof off my car and onto the floor - Not pretty.Im looking for a nice one. Ahh - dispite the glass breakage - the car won Best Buick! I guess that made me fell alittle better. Larry